Today, I installed a Hayward, top mount sand filter. This filter replaced an undersized, single cartridge filter that the home owner had to clean each week during the summer to keep his cleaner running and the pool from turning green. This sand filter can be back washed unlike their old cartridge filter, making ongoing maintenance easier for the homeowners. The concrete pad under the old filter and pump, was cracked. I replaced the old single concrete pad, with two smaller pads. I like to do this on many installs, because it allows me to center a pump and filter on their own pad. In this case, the placement of two separate pads provided a place to stand when accessing the time clock. Before, that area was always wet from the drip system feeding plants on the other side of the wall and the customers had to step in mud to check the strainer basket and access the timer.